You are currently converting frequency units from millisecond(period) to second(period)

1 ms(p) = 0.001 s(p)

millisecond(period)

second(period)

Period

The period is not the same dimension than the frequency. The frequency (f) is the reciprocal of the period (T) : f = 1/T We have merged period and frequency here to allow easy conversions between both dimensions.